CUSTOMER CONCERN Hybrid System Warning instructs the driver to stop safely, the READY lamp flashes, and DTCs P1B70 and P1B96 reset immediately after clearing. CAUSE High-voltage battery cell-voltage imbalance confirmed a failed battery; a cell below 1.5 volts sets P1B70 and a spread greater than 1 volt sets P1B96. CORRECTION Remove and replace the high-voltage battery, clear DTCs P1B70 and P1B96, and verify balanced cell voltages and normal READY operation.